To get an idea of exactly how small the worldâs smallest insect is, take out a ruler and look at those tiny lines that appear in between centimeters (make sure youâre not on the side that measures in inches). If in doubt, ask a grown-up to help you find the millimeters.
Diarrhea can also cause weight loss. Abdominal pain is another symptom of colon cancer that may prevent you from eating normally. If you have lost a significant amount of weight accompanied with these symptoms, you need to talk to your doctor immediately to determine the cause.
Certain cancers can cause diarrhea, including: 1  Hormone-producing (neuroendocrine) tumors, including carcinoid syndrome and Zollinger-Ellison syndrome. 2  Colon cancer. 3  Lymphoma. Medullary carcinoma of the thyroid gland.  Pancreatic cancer.